This article will help you troubleshoot issues related to your iPad Internet connection.
Check if your iPad is in Airplane mode
If you see an airplane in the top left corner, your iPad for sure has no Internet connection
1. Swipe up from the bottom of screen, to reveal the control panel
2. Tap the airplane to switch Airplane mode off
Check your Internet connection
1. Open Safari and check of you can open a web page, such as www.apple.com
Perform Carrier Settings update
See this article for resetting your network settings and updating your Carrier Settings